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首页> 外文期刊>Revista rvore >Estrutura e rela??es ambientais de grupos florísticos em fragmento de floresta estacional subtropical
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Estrutura e rela??es ambientais de grupos florísticos em fragmento de floresta estacional subtropical

机译：亚热带季节性森林片段中花卉群的结构与环境关联

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The objective of this study was to determine floristic groups of the shrub-tree vegetation strata of an excerpt from Forest Subtropical Deciduous slope in Parque Estadual Quarta Col?nia, Rio Grande do Sul, Brazil, to analyze their structure and to determine key environmental factors for plant species occurrence, in order to provide restoration programs of of degraded areas as reference ecosystem. A phytosociological survey was carried out for vegetation analysis on 12 plots of 200 m2 (10 x 20 m), systematically distributed on a topography gradient at 20 m interval, systematically distributed on four tracks of 100 m between them, following the gradient of topography. In each plot, it species was identified and it was measured circumference at breast height (CAP) and overall height of tree individuals, represented by those with CAP 115 cm, named upper stratum. Understory strata information was obtained on circular plots of a radius of 1.78 m, set up in the center of 10 x 20 m plots, from individuals with height 30 and CAP<15 cm. Environmental variables were steepness, light intensity and soil chemistry and texture. Data analyses of vegetation structure and diversity were evaluated by using TWINSPAN and environmental correlations of floristic composition by using CCA (Canonical Correspondence Analysis). It was identified two groups, with species composition belonging to different stages of natural succession, suggesting differences of agricultural land use history and soil chemical characteristics. For that, some species may be indicated in forest restoration programs.
机译：本研究的目的是确定Parcup Estadual Zharto Col？Nia，Rio Grande Do Sul，巴西的森林亚热带落叶的植物植被群的植物群体分析它们的结构并确定关键的环境因素对于植物物种发生，为了提供恢复区域的降级区域作为参考生态系统。对植物遗传学调查进行了植被分析，用于12个200m 2（10×20μm）的12个块，系统地分布在20米间隔的地形梯度上，在地形梯度之后系统地分布在它们之间的四个100米的轨道上。在每种曲线中，鉴定IT物种，并在乳房高度（帽）和树质的整体高度下测量，由帽115厘米表示的上层地层表示。在半径为1.78米的半径的圆形图上获得较长的地层信息，位于10×20米图的中心，从具有高度30和帽15厘米的个体。环境变量是陡峭，光线强度和土壤化学和质地。通过使用CCA（规范对应分析）使用植物组合物和环境相关性来评估植被结构和多样性的数据分析。它被确定为两组，具有属于自然继承的不同阶段的物种组成，表明农业用地利用历史和土壤化学特性的差异。为此，某些物种可以在森林恢复计划中指出。

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